Member Avatar for rundbarah

hi every body i need help is there any prolem if i add anew ram with bus speed 800 and i have ram bus speed 667 please can any one answer me
thanks

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  • Latest Post Latest Post by caperjack

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Short, practical follow-up to (and to the differing replies from and ): here is a safe, no‑nonsense checklist and a few troubleshooting tips so the next steps are clear and reproducible.

  • Confirm the basics first: make sure both sticks are the same DDR family (DDR2 vs DDR3). Different families are physically incompatible and will not fit the same slot.
  • Inspect SPD/timing/voltage information before you install anything. Use a tool like CPU-Z on the existing stick (or read the module label) to record model, rated speed, voltage and CAS timings. The SPD data tells the motherboard what the module supports; background on SPD is at Serial Presence Detect.
  • Check the motherboard manual / vendor memory QVL for supported speeds and recommended slot population. Some boards are picky about mixes and require matched pairs for best stability and dual‑channel operation.
  • Fit the new stick, enter BIOS/UEFI and note the detected memory settings (speed, voltage, timings). If the system fails to boot or is unstable, reset BIOS to defaults, update BIOS if an update exists, then retry with conservative/manual timings or the lower safe voltage.
  • Validate stability with an independent tester: bootable MemTest86 and run multiple full passes (several hours). If errors appear, return to a single stick or buy a matched kit.

A final note: mismatched capacities can affect dual‑channel behavior (some controllers use a mixed/flex mode). If the goal is maximum reliability and performance, matched sticks sold as a kit are the least risky choice.

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Member Avatar for Rik_

Mixing ram speeds is a very bad idea indeed unless you want your computer to keep crashing that is!

Member Avatar for caperjack

i have mixed speed many times ,with little or no problems , the 800 should run backward compatible and run at 667 in your case

Member Avatar for Rik_

In particular, if it's an Asus mobo it's very likely to have problem with mixed ram!

Member Avatar for caperjack

its been 1997 since i owned a Asus board ,lol, maybe that explains it

I/we mix same brand different speeds all the time on different board ,maybe were are lucky ,Iam not saying problems with some bards isn't a problem ,just saying i have done it many times on other peoples computer and used ones i have sold over the years ,

Edited by caperjack because: n/a
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